Steam-boiler.



M. W. SEWALL.

STEAM BOILER.

APPLIOATION FILED MAR. 4, 1907.

Patented 13411.31, 1911.

entra n arena can: i

MINUTE. W. SEWALL, F ROSELLE, NEW JERSEY, ASSIGNOR TO THE BABCOCK & WIL- COX COIVLANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

STEAM-BOILER.

Specification of Letters Patent. Application fiIed March 4, 1907.

. Patented Jan. 31, 191.1. Serial No. 360,348.

panying' drawing.

Be it known that I, MINOTT'VV. SEWALL, a citizen of the United States, residing at Roselle, in the county of Union and State of New Jersey, have in'vented certain new and useful Improvements in Steam-Boilers, of which the following is a specification, reference being had This invention relates to steam boilers wherein a group of inclined water tubes are employed, and the primary object of my present invention is to increase the eliiciency of such type of boiler.

The problem of high efliciency in a water tube boiler involves not merely economy of space and convenience of operating, but also 1 (l) the proper circulation of the water and a boiler containing my invention separation of steam therefrom; (2) the proper combustion of the fuel, and the proper circulation of the hot and there is acomplete interdependence of efiiciency between these several factors. In the boilers of the type referred to at present in use,

r the circulation of the water and the separation of the steam therefrom is similar to my construction and one object of my invention is to attain a higher etliciency by an arrangement for the circulation of the hot gases and the combustion of the fuel.

In the accompanying drawing, I have shown a side elevation partly in section of in the best form in which I contenmlate embodying it at the present time and which may be described as follows:

l is a group of inclined water tubes connecting the headers 5, 5 at opposite ends. 9 is the steamaind water drum, and is connected with h rader a by the series of tubes 4 and with the header 5 by the series of tubes 13. 19 is the mud-drum. The circulation of the water, therefore, is upwardly inclined tlnough the tubes .1. into the header 5; thence through the tubes 13 into the steam and water drum 9 Where the final separation takes place; thcncc downward through the series of tubes 4- into the header 5. whence the circulation is repeated over and ovcr again. The hcatcd gases of combustion n-mkothrcc trunsvcrso passes .=\-l-'C among the tubes to they make a longitudinal pass X under lying the transverse passes 13 and C and emptying info the transverse pass A. As

therein to the accomand preliminary there in position and size relatively to the other passes enables the hot circulating gases from the combustion to cooperate more etliciently with the circulation of Water within the tubes. The group of tubes may be divided into the passes above referred to by the transverse batllcs 6 and 7 and the longitudinal battle 4 which runs parallel with the tubes and connects the header 5 with the foot of the transverse baffie 6. I prefer, also, to use a longitudinal bafiie 3 extending at the foot of the group of tubes and parallel therewith from the header 5 underneath the passes A and X.

1l "is thespace above the tubes througl'i which the gases proceed from the pass A to the pass B. 12 is the space through which they proceed from the pass C to the uptake 20. The spaces 11 and 12am separated by the partition let.

2 is the furnace chamber underlying the passes A, X and B, which is connected near its roof by the longitudinal throat E with the space 2 from which the gases proceed upward to the pass X. The furnace chamber 2 is formed by the grate surface 15, the bridge wall 16 and the revel-berating roof 3 of arched hrebrirk cxtendingtrom the front wall 18 over the furnace chamber 2 and preferably over and beyond the throat E and forming the front boundary of the uptake passage into the pass X. If the battle 3 be employed, the rearward ends of it and the roof 3 meet, as shown. This junction may be formed by all-arch 17 supporting the rear end of the batile 3. The presence of the roof 3 or battle 3, or of both, sc 'iaratcs the tubes nearest the fire c. the lower row of tubes) from the fire" and thus decreases the etiiciency of that lower row of tubes, but the efiiciency of the tubes above the lower row is increased by the presence of the battles and the increased perfection of'combustion due thereto and to the reverberatory roof of the furnace.

. In the preferable form above described, my construction may exteriorly occupy a space horizontally and'vertically similar to that occupied byihorizontal water tube boil- 1 ers of the most approved type heretofore in use. Moreover, before the gases are permitted to pass between the tubes their conibustion is stimulated by the roof 3 confining. them and compelling them to flow longitudinally over the fuel to the rear of the tubes. After entering between the tubes they are compelled to travel a long distance among the tubes and are brought in contact with the various parts of the group of tubes and the order of their passage with respect to 1 the circulation of the water is such as to obtain the greatest efficiency. The course of the gases from the furnace chamber to the rip-take is indicated by arrows.

The structure represented is especially adapted for the burning of bituminous or low grade anthracite coal (1) by the reverberatory action within the furnace chamber, and (2) by reason of the increased distance traveled by the gases and consequent retention among the tubes. The gases have opportunity to absorb such an amount of oxygen from the air as to produce very coin plete combustion and prevent excessive smoke while they produce in the water at the proper points the desired circulation and generation of steam.

In the use. of this invention in different situations and with different kinds of fuel either the arched roof 3 or the battle 3 may be dispensed with. I The location of the firdoor of the furnace chamber may be placed at the opposite end of the structure from that shown, in which such instance, of course, the batlles 3 and i will be transposed or re-arranged accordingly without changing their relationship to the furnace.

Nhat I claim. and desire to secure by Lettcrs Patent of the United States is 1. In a water-tube boiler, in combination,

the group of inclined water tubes, the furnace, a roof extending from the front of the boiler toward'thc rear thereof and separat 111g the furl chamber from the lower row of tubes, a longitudinalbatlle located in said group above a plurality of rows of tubes and extending from the rear toward the front and a plurality of transverse battles di iding the space above said longitudinal batlie in said group into a plurality of transverse passes.

2. In a water-tube boiler, in combination, the group of inclined water tuhes,'the furnace, a roofextending from the front of the boiler more than two-thirds the distance toward the rear thereof and separating the fuel chamber from the lower row of tubes, a longitudinal battle located in said group above a plurality of rows of tubes and extending from the rear more than half the distance toward the front and a plurality of transverse bailles dividing the space-in the upper portion of said group into a plurality of transverse passes.

3. In a water-tube boiler, in combination, the group of inclined water-tubes, the furnace, a roof extending from the front of the boiler approximately tivc-sixths the distance toward the rear thereof and separating the fuel chamber from the lower row of tubes, a

longitudinal battle located in said group above approximately one-third the rows 9f tubes and extending from the rear approxi? mately twothirds the distance toward the front and a plurality of transverse battles dividing the space in the upper portion of said group into a "plurality of transverse passes.

In testimony whereof I atlix my signature in presence of two witnesses.

MING T IV. SEYVALL. Yi itnesses WM. L. Rrcininn, AUoUs'rE G. PnArr. 

